Surface Ship Detection from Active Sonar Image Data by pharmphresh23

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									Surface Ship Detection from
  Active Sonar Image Data




         Image from Applied Research Labs, UT




            Daniel Huff
             05/05/05
                              Optical Flow Method

           •     separate static image and dynamic return sequence via time-
                 domain filtering

           •     input images must be exactly aligned
LANE et al.: ROBUST TRACKING OF MULTIPLE OBJECTS IN SECTOR-SCAN SONAR IMAGE SEQUENCES                                          33




Fig. 3. Processing stages for moving object detection, motion characterization, and tracking.
                                                                                                [Lane, Chantler, & Dai 1996]
Clutter Map
Processing

•   Geometric fading algorithm

•   Suppress image features that
    appeared in previous frames

•   Only works if successive
    images are exactly aligned


        Figure from Lo & Ferguson, 2004
     Moving Platform Problem:
        must align images

•   Previous work: fixed platform or target

•   Current work: moving platform and target

•   Inertial & compass data too coarse

•   Manual ad-hoc image alignment works*

•   Proposal: use coarse navigation data as an initial constraint
    for automatic image alignment


             Previous work: [Lo & Ferguson 2004], [Perry & Guan 2004], [Lane, Chantler, & Dai 1996]

								
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